<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
    "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Firefox测试</title>
</head>
<body>
<script type="text/javascript">
var a = "Python";
var b = "爬虫开发";
document.write(a,b);//网页上输出内容
console.log(a + b);
console.debug(a + b);
console.error(a + b);
console.info(a + b);
console.warn(a + b);
</script>
</body>
</html>
